A 355-kg satellite is launched into a circular orbit that has a period of 696 min and a radius of 20, 300 km around Earth. Determine the gravitational potential energy Uorbit of the satellite's orbit. Uorbit = J Estimate the energy ΔE required to place the satellite in orbit around Earth. ΔE =
A 26.5−kg object sitting at rest is struck elastically in a head-on collision with a 21.5−kg object initially moving at +3 m/s. Find the final velocity (in m/s) of the 26.5−kg object after the collision. [Round your answer to the nearest tenth.]
A small block with mass 0.0400 kg slides in a vertical circle of radius 0.790 m on the inside of a circular track. There is no friction between the track and the block. At the bottom of the block's path, the normal force the track exerts on the block has magnitude 3.40 N. Part A What is the magnitude of the normal force that the track exerts on the block when it is at the top of its path? Express your answer with the appropriate units.
During a pregame warmup period, two basketballs collide above the hoop when in the positions shown. Just before impact, ball 1 has a velocity v1 which makes a 35∘ angle with the horizontal. If the velocity v2 of ball 2 just before impact has the same magnitude as v1, determine the two possible values of the angle θ(θ1 < θ2) measured from the horizontal, which will cause ball 1 to go directly through the center of the basket. The coefficient of restitution is e = 0.65. Answers: θ1 = θ2 =
Two people (each with mass 80 kg) are raising a heavy block (of mass 100 kg) as show in the picture below. What is the minimum coefficient of static friction between the people's shoes and the ground required so that they can raise the block with an acceleration of 1 m/s2? 0.1 0.3 0.7 0.8 0.9